Yusuf and the 19-year-old woman were detained by the police here last night.
The woman's father had registered a complaint with the police accusing Yusufof kidnapping his daughter.
According to SP (Rural) Jagdish Sharma, the two were staying with a relative of Yusuf in Hathin village in Ballabhgarh district of Haryana.
They will be produced before a magistrate in the district today, an official said. The disappearance of the two had led to tension in the area.
Ghulam's family had alleged that the activists belonged to the Hindu Yuva Vahini, which however stressed that none of its members were involved in the incident.
The police have arrested three persons in connection with the murder.
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